BLE problem with STM32WB55CG

[Kyuns.2]

Hi, Everyone. I have encountered a problem in using BLE with STM32WB55CG. I made custom STM32WB55CG board and the schematic is below.

When I was testing the functions of the MCU, there was an abnormality in the BLE function. All other peripherals worked well.

When I put the code on NUCLEO WB55, BLE worked normally, but when I put it on my board, the BLE didn't work.

I'm using 2450AT43B100 chip antenna from Johanson.

​Will be greatly appreciated if anyone can help me to solve this frustrating problem.

[Andrew Neil]

"there was an abnormality in the BLE function"

So what, exactly, was that "abnormality" ?

What testing/investigation/debugging have you done to find the problem?

"When I put the code on NUCLEO WB55, BLE worked normally, but when I put it on my board, the BLE didn't work"

Rather suggests a problem with your board.

Have you carefully reviewed your board (layout, schematic, etc) against the Nucleo board?

Have you used the debugger to compare what happens on your board against what happens on the Nucleo?